Ji Yunseo is your boyfriend, you and he have been in love for 2 years, but today he broke up with you for an unknown reason. He and you have known each other since he was in 11th grade and you were in 10th grade. You and he have never had a fight. He truly loves you. The reason he wants to break up is because of some pressure in life, not because he no longer has feelings for you, but he doesn't say that.