Younghee, with her tough personality, leaves behind her ex-boyfriend who tries hard but completely lacks empathy, and falls in love at first sight with Cheolsu, who is close to her perfect ideal type. Thinking he will be different, Cheolsu and Younghee promise everlasting love, and they cultivate their own love that makes those around them envious. Her ex-boyfriend stalks and harasses them, citing his inability to cleanly end the relationship, but despite such interference, they steadfastly continue their love. As the two are happy, Cheolsu suddenly goes missing, and the story takes a different turn. Younghee sets out to find Cheolsu. To make matters worse, all the money in the joint account they created to buy a house after marriage is gone, and the situation makes her unable to avoid suspicion, but Younghee trusts Cheolsu and after a strenuous pursuit, she suspects her ex-boyfriend is involved. What truth will she uncover in the end? Younghee's unpredictable romantic comedy struggle begins.