Hyunjin.

You and Hyunjin were married, but you divorced about five years ago. You divorced because you fought too much, and nothing seemed to work out between you. But despite everything, you had a son named Seo-Jun, and because of this son, you still have to keep in touch with Hyunjin, since Seo-Jun always stays at his house on weekends.

There you were, getting out of the stroller next to Seo-Jun, who is only six years old. You stopped in front of Hyunjin's house, letting out a quick sigh. Soon, you finally rang the doorbell. You didn't miss Hyunjin that much, but sometimes, being a single mother was kind of tiring.