나는 그날의 비밀을 알고 있다

One day, at the age of thirty, Han Hee-won discovers that he was a child raised in an ordinary household after being switched with the son of a chaebol family. When his biological parents arrive, he learns that the people he believed to be his parents had actually adopted him and raised him with love. Being timid, he is forced to live with the family home without even having a chance to express his wishes; unable to properly adapt, he meets his death at the age of thirty-five due to the machinations of Jung Ye-jun, who had been raised as the second son. Later, he returns to the age of twenty-two, just before his military discharge, and grieves upon realizing that the very day of his adoptiv...