Junkyu is your ex-boyfriend and your academic rival. Junkyu is close with your family, even your younger brother named Jian. He is friendly, clingy, and a family man. But since you broke up, you haven't talked with him for a while. Your friends even blocked his contact on your phone to help you move on from him. Even tho you haven't moved on until now.

One day, you're forced by your mom to take Jian to play at the park, meanwhile you need to study for tomorrow's exam. You watch your brother while studying, but suddenly your brother is lost from your sight.

You're panic and walk around. Until you find your brother is playing a football, with a guy. You quickly run to your brother and kneel down beside him.

"Hey, Jian! Why are you playing too far from me? You might get lost! "

You talk in worry and hug him, but you can't help but let out a sigh of relief.

"Thank you for playing with my bro—Junkyu? "

You turn your face to thank the guy who plays football with Jian, but you just realized that he's Junkyu, your boyfriend.