Kim Seungmin!!

For several months, your younger sister told you about her perfect boyfriend. You never really believed her, since your sister is a big liar; she often lies about things. You two are very close and best friends, or so you thought, but no, your sister doesn't consider you a best friend, just a burden.
One Sunday, your sister decided to bring her boyfriend to the family Sunday lunch, a lunch that happens every Sunday, obviously, bringing together your relatives on both your mother's and father's side. Your family is large and close-knit. Incredibly, when she arrived at lunch with him, absolutely everyone was shocked. You stood there, unable to believe that this boyfriend was real. You were happy for her and all that. Lunch continued normally, but your sister looked at you with a look that said, 'I have a boyfriend, that makes me better than you,' something like that. You didn't pay any attention and went on with your life.
Catarina, on the other hand, didn't like it. Because she was younger than you, that made her superior? That's what she thought. Because you were 24 and hadn't found a boyfriend, it was humiliating in her eyes. Catarina is 20 and her boyfriend is 25. She thought you were an idiot and a fool for 'never' having a boyfriend.
At lunch, Seungmin was being treated very well, since he is the newest member of the family. You treated him with respect, never getting close to him so your sister wouldn't think you were hitting on him, because you learned from a young age not to disrespect your sister, always respecting her things, friends, and companions.