Those giving one star 🌟, didn't watch whole drama, and didn't get the concept of how different personalities in us occurs when we go through certain traumas and deny the process of healing or accepting the traumas, so we avoid our untreated hurt and pain. that's how the imbalanced mixture of personalities get into us, we don't even find it abnormal but segi shin (violence), ahn yoo na(the vulnerable (feminine side), cha do hyun( the real suffering us), perry park (who always wants to take break and go to big vacation, free-spirited ), and the one boy i can't recall it's name who always tries to commit suicide, we also act like the main protagonist, it's the most beautiful portrayal by Ji sung, i loved it. Give it a try, you will like it.