Despite being disappointed that no one has mentioned his birthday, Mu Han tries hard to hide it. While he's feeling sorry for himself, he sees unit 401's cat on his mantle. Mu Han finds out that she is a wicked lady, who cares only for herself. After a day of doing things that would've been out of his nature in the past, Mu Han is shocked to return home to find a surprise party waiting for him. He realizes how much Soon Jin has changed him for the better.
무한과 순진의 이야기, 그 마지막.
평범한 하루도 특별한 사람과 함께여서 행복한 그들.
아주 특별한 날을 맞이해 특별한 시간을 준비하는데.
죽어가는 시간이자 살아가는 시간을 나누는 두 사람.
그들은 순순히 마지막 작별을 맞이할 수 있을까?