Substitute Boyfriend

Shortly before their wedding, Haegeum is blindsided by an outrageous proposal from her fiancé. Instead of discussing their future together, he suggests that they each indulge in one final passionate affair with someone else before settling down. Devastated and deeply shocked by his selfish request, Haegeum ultimately agrees to the arrangement, but not out of a desire for freedom. Her acceptance is driven entirely by a need for revenge. She is determined to make him regret his callous suggestion, and she decides the most effective way to wound his pride is by finding a younger, more attractive partner who completely overshadows him. Fate intervenes when the ideal candidate unexpectedly moves in right next door. Sihoon is everything her fiancé is not—handsome, accomplished, and effortlessly charming. However, there is a significant complication standing in the way of her plan: Sihoon happens to be her younger brother’s closest friend. This unexpected connection threatens to turn her calculated scheme into a tangled web of personal complications. As Haegeum draws closer to the captivating young man next door, she finds herself navigating a delicate balance between executing her vengeful plot and managing her growing genuine attraction. Now, she must determine whether she can successfully exact her revenge while also holding on to the man who was only supposed to be a substitute.