Question: why sian is called daebak?
Answer: Daebak's real name is Lee Si An, but he's been called Daebak (which as an expression means epic or awesome in Korean) as a nickname since his mother Lee Soo Jin was pregnant with him. ... “Daebak is Si An though!” replies Soo Ah. Lee Dong Gook then turns around to say to his son, “Daebak!