From the blue sky to the underworld, I only want to be with you forever!
A person who is used to walking in the darkness and struggling in killing, cold, ruthless, cruel...
A lazy, prank-loving and trouble-hating person, unintentional, willful but lonely...
What kind of affection makes such a person promise to be with another person for eternity?
Is it because that person swore to protect each other to the death? Or was it because of the unintentional smile that the man showed when he raised his head? Indifferent and extremely lonely...