On that day, I was going to confess to you. Choi Ji-young, an unidentified woman who accidentally encountered her on Ulleungdo Island. Sunwoo Hyun keeps bothering Ji-young. Two people who are attracted to each other even in a short period of time. Then one day, Ji-young suddenly disappears. Without a trace. "It's been a while, Hyun. Aren't you going to say hello?" Ji-young, who could not be found no matter how much she visited, became the "Choi Ji-an" and appeared in four years. That's also for Hyun to protect. "With this time, there is no Choi Ji-young I knew. So, just delete it too."