The conference and the workshop are both located within the hotel.
see https://ro-man2023.org/overview/venue
By bus
Busan Bus operates a bus (Line 1003) from Busan Station to Haeundae Beach every 15 minutes. Tickets cost $1 - $3 and the journey takes 27 mins.
By metro
From Busan Station, take metro Line 1 to Seomyeon Station, then metro Line 2 to Haeundae Station (costs $3 - $4). The hotel is another 10-minute walk. The journey takes around 50 mins.