Main lead is on the verge of dying. at the very moment of him commiting s** he finds a way to spare himself and meets Main female lead. he finally sees the reason for living, very literally he lives for Hwa Sun meaning he would even be imprisoned for her since he feels he owes his life to her. when i see it this way, i don’t feel so tortured that an innocent man was imprisoned, as this was his only wish. rather than live his sad and daunting life, he finds peace in ensuring Hwa Sun and her niece are at peace. Suk Go’s was willing to protect her till the end. however the ending is bitter. he smiles while she cries. she is clearly suffering as in a perfect world they would just live happy and free. unfortunately a horrible monster came along and changed their lives forever.