Sean and his twin sister Sherry both grew up together. However unfortunately, at the age of 7, Dark Lord Mael had kidnapped Sherry to experiment on her. Sean was traumatized. He vowed one day to grow strong and defeat the Dark Lord. One day, the young Sean was wandering around Greenhorne all alone. He met someone named the Great Sage, Merlin. He saw her and her amazing magic help the people of Greenhorne Town once, and wanted to become strong like her. He went up to her and told her that she was really cool. And did not stop following the friendly mage after she walked away. Because he didn't even have a home or really any parents of his own, Merlin decided to take Sean in and raise him as her own. Sean became Merlin's apprentice and Merlin became Sean's mentor.
Since then, Sean learned how to harness basic and elemental magic but he was not quite good at Light Magic like Merlin was. The two learned a lot about each other and grew close. Merlin eventually disclosed her mission to research a calamitous being named the Dark Lord to Sean. After she described how she looked to Sean, he recognized him. Mael. He was the one who took Sherry away from him. Sean disclosed that about himself as well. Merlin vowed that not only was she going to defeat the Dark Lord with Sean but also save Sherry from Mael's clutches.
Once Merlin caught word of Dark Lord Mael's attacks. They set out on their adventure. However, it would be short lived. Once Merlin meets Alexis for the first time, she senses a divine heroism about her that will soon grow with time. Merlin then advises Sean to go with Alexis on her quest to defeat the Dark Lord. They will be able to grow together and Sean will become a powerful mage like the Great Sage. She has a lot of faith in Alexis and helps her throughout her journey. And Sean sets off alone to find Alexis and her party.