Uhm

no wonder he looks so familiar!

Nahh it can't be. Timeline doesn’t add up

No, Siwoo is not Mujin’s son. But Siwoo did show up here and in the side stories bc Byul became friends with him in daycare. Hyesung and Dojin cried bc Siwoo was Byul’s first boyfriend and Siwoo kept following Byul around at daycare lmao