Luka (루카) is the fifth participant who was first introduced in ALIEN STAGE: Prologue. His song "Ruler of My Heart" is performed during Round 5 where he sings alongside fellow contestant Mizi. He competes against contestant Till in Round 7, the Final Round, singing "Blink Gone". The song, "Wiege", is a duet sung between him and Hyuna, and it dives deeper into his backstory as well as the aftermath of the Final Round.

He is the oldest participant in the series.

While he appears princely and charismatic on stage, Luka is determined when it comes to the pursuit of his goals, and is revealed to be ruthless, manipulative, and cunning, going so far as to exploit Mizi's grief over Sua's death in order to undermine her performance during Round 5, and repeating the same technique with Till's conflicted emotions on Ivan's death during the final round.

While Luka mostly keeps to himself and rarely displays any form of genuine emotion offstage, he is shown to brighten up and become overwhelmed with emotion whenever Hyuna is present as he displays feelings for her and was close with her in the past.

From Hyuna's perspective[1], her inner monologue reveals a bit more of Luka's personality past the facade he puts on stage, showing a more vulnerable side that loves and values those close to him more than himself, despite struggling with showing such feelings in a healthy way.

It is possible he uses age regression[2] as a coping mechanism[3], as he's often shown displaying child-like behavior such as sucking on his or Hyuna's sleeves, or directly slobbering on her face back in ANAKT GARDEN[4], despite being older than her and other children.

Luka has unkempt blond hair and yellow eyes of the same color. His fingers, from the midsection onwards, are a vibrant purple hue.

He can frequently be spotted in a white blouse with an uneven hemline, which is cinched at the waist with a belt. Pearl chains cascade down from the top of his shoulder blades, while a sizable and lengthy bow is positioned at the back of his collar. He dons a pair of black, ankle-length slacks and plain white shoes.

During Round 7, Luka changes his blouse to an open-back suit jacket, a cut being made to show his left side, and pairs with matching white pants and shoes. Like his Round 5 attire, his top is also secured with a belt at his waist. His hair is slightly longer, and styled in a half-updo. In addition, he has rings fitted on both thumbs and his left index finger and right middle finger, as well as an arm band of the same shape as the rings on his left upper arm.

His branding is located on his left hip, and a surgical scar can be seen in close proximity to it. The scar is mirrored on the right side of his body and another faint scar sits on his sternum.

Little explicit information is available regarding Luka's background. However, it is mentioned that he previously won the 49th season of this competition[5], earning him the title of "the greatest performer on ALNST."[6]

Due to his immense popularity among the Segyeins, he popularised the pet-human industry and started the trend of "Luka Syndrome."

Upbringing

Luka was artificially created, along with several clones of himself. [7] Luka's guardian, Heperu, aimed to create a perfect specimen of a human that is specifically engineered for winning Alien Stage. Hence, several qualities of Luka were deliberately genetically modified before his birth, including his angelic appearance, dancing talent, stage presence and singing talent. There is a possibility that he could have spawned already being some years old, making him mentally and emotionally younger than his actual age.

Luka had a very difficult and abusive childhood, which contributed to his lack of empathy and manipulative personality on stage. In Patreon, it is revealed that he undergoes "harsh trainings", which includes controlling and monitoring his heart rate. This made Luka obsessed with heart rates as he was trained to keep his heart rate at a constant 70bpm-90bpm, highlighting the need always to keep a composed, calm and apathetic self under any circumstances. Furthermore, Heperu also induces a fear of death into Luka to push him further to win Alien Stage, through the methods of purposefully stopping his heart momentarily, putting Luka through an extremely excruciating experience. This can be the reason why he is so determined to win the rounds no matter what, due to his traumatic fear of death since he was young. There are many more possible "harsh trainings" that go behind the scenes that contributed to Luka's complicated personality and psychology. His trauma and abuse made him unable to go through a normal childhood compared to most of the kids in ANAKT GARDEN.

In the deleted scenes of Wiege shown in Official Vivinos' patreon, there were scenes of luka bleeding against the floor after "harsh trainings". It also implied that he might have self-harmed since he was young, as there were deleted scenes of him slapping himself after waving to his ANAKT classmates with no response back.

In the Official Patreon, Vivinos also explained that Luka counting his fingers in "Wiege" is a coping mechanism to stay grounded, as a way of feeling in control and knowing he is still alive after all the abuse he went through.

In the beginning of "Wiege", it shows the aftermath of child Luka's slaughter of his clones. Although his face looks scared and traumatised, the reason behind this act is not yet clear.

It is confirmed in the Anakt Garden Book that Luka has asthma, chronic migraines, and congenital heart disease[8], which explains his purple fingertips. This symptom is called Peripheral Cyanosis[8], where low blood flow and oxygen is reaching the extremities, tips of fingers and toes. His fragile health might be due to Heperu's artificial creation of Luka, as beings of artificial breeding tend to have more fragile health problems. Due to this, the segyeins often have to monitor his health and conduct multiple experiments and surgeries on his body to keep his state functioning. This latter information can be deduced from his flashbacks throughout "Wiege".

At some point during his time attending ANAKT GARDEN, he was close with Hyuna, and her brother, Hyun Woo. In Vivinos' official Patreon, it was detailed that the conflict between Hyun Woo and Luka began with Hyun Woo's small, child-like feelings of jealousy and disappointment, most likely from the fact that Hyuna gives more attention and love to Luka than to Hyun Woo. This angered Hyun Woo, and he began a fight with him. In "Wiege", Luka is seen confused and clutching onto Hyuna for support. Vivinos in the official Patreon then continued to explain Luka, who lacked the resilience to accept it like an ordinary child, ended up displaying impulsive violence, ultimately leading to Hyun Woo's death. This event is confirmed to the reason behind Hyuna's negative sentiments about Luka.