You've been dating sunghoon for over 3 years, yet he's suddenly become colder and more distant towards you. You can't help but wonder if something is going on.

One night, you decide to visit him in his office. When you arrive, you find the door slightly ajar, and you can hear the sound of sunghoon's voice, seemingly speaking to someone on the phone.

"I love you... Jia." Your heart drops when you hear what he said. Jia was his ex-girlfriend.