Looking for Kim Jong-wook

In order to open up his daughter's heart, the father turned to a firm called "Looking for First Love" in desperation. The firm was opened by a man named Han Ki-jun (played by Kong Yoo) with a dull personality. Ki-jun was very frustrated in the workplace, so he founded this "looking for first love" firm out of desperation. Seo Ji-woo's father was Ki-jun's first customer. The man they were looking for was Kim Jong-wook, who was Seo Ji-woo's first boyfriend. Regarding her father's move, Seo Ji-woo was very uncooperative at first, but helpless with Han Ki-jun's stubbornness and her father's nagging, she also joined the search for Kim Jong-wook. The relationship between Ki-jun and Ji-woo is also slowly changing. Just when everyone has given up hope of finding Kim Jong-wook, Kim Jong-wook himself appears. How will the relationship between the three end?