

Kyle Hubert, an executor from the Underworld, agrees to Old Mr. Carter's dying request: marry into the Carter family under contract and protect them for three years.Despite his silent guardianship, the Carter family treats him with contempt and betrayal, ultimately expelling him just as the protection period ends. When the Carter family faces deadly calamity once more, they finally learn the truth about Kyle’s sacrifices and desperately beg him to return.

Rex Palmer was a world-class computer tech titan. Because he had once been helped by Sandy Brook, he turned down numerous offers from big companies and stayed at Brook Group, developing the Loki System for a meager salary. Lena Mona, who worked at Mona Investment Firm, knew Rex's capabilities well and strongly pushed for an investment in Brook Group.However, Rex had a fierce conflict with Brook Group's manager, Justin Dutt, over a leave-of-absence issue. Sandy chose to side with Justin and even fired Rex. With Lena's help, Rex started anew and eventually crushed Brook Group in the field of artificial intelligence. Sandy deeply regretted her decision, but it was too late.

The mysterious secret agent Peter Rogers was awarded the National Medal of Honor by the President and had retired from the military. While dining out with his daughter Leslie, Peter is mistaken for a blind date by the beautiful CEO Sydney Greenfield, and the two unexpectedly get married. When his classmate and ex-girlfriend, who were unaware of Peter's true identity, encountered him again, they subjected him to various insults and ridicule. Upon hearing about this, Sydney publicly revealed that Peter was her husband, putting everyone to shame.