Chi Mo, a wealthy CEO, begins to experience a shift in his personality after meeting Hao Chongmin. His alternate personality, Song Xiaoxao, emerges—fun-loving and carefree, the opposite of Chi Mo. As Song Xiaoxiao forms a bond with Hao Chongmin, Chi Mo struggles with his two identities and the mystery of a past car accident. The two must navigate their conflicting personalities while uncovering the truth behind the accident.