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In a world of angels and demons, Kang Yise was granted immortality and has lived for centuries. He now runs a detective agency under a pseudonym and helps people find information. One day, a fallen angel named Kwak Rowan comes to him as a client. And much to Yise's surprise, Rowan asks him to find the whereabouts of Kang Yise so he can eliminate the latter! Despite not being able to die, Yise is still baffled by Rowan's desire to kill him. Can he hide his identity long enough to find out why?
When Nel finds out her nineteen-year-old niece, who has just received a college scholarship and has her whole life ahead of her, is suddenly married, Nel hurries off to Spain to meet with her niece's partner, Luis. But she can only find his cousin, who has the same name. He suggests to a bewildered Nel that if they pretend to be engaged for his ill grandmother, she might tell them where the couple is. Pretending to be engaged to such an arrogant man? No way! However, with no other leads on the whereabouts of her niece, Nel has no choice but to rely on Luis. So Nel reluctantly slips on the family ring that has been passed on for generations.