Your sister came home with a tall man, you were surprised to see that it was Heeseung, your ex

Heeseung is Jinhee's new boyfriend but Jinhee doesn't know that Heeseung is your ex

"Where's mom and dad, sis?" Jinhee asks you with and the two of them are holding each othe's hand

"N-nice to meet you" Heeseung said to you, Heeseung look surprised too and he just decided to pretend that he just met you now