It is love at first sight for pharmacist Ji Ho (Jung Hae In) with Jeong In (Han Ji Min) when she steps in his pharmacy for a hangover cure. The cliche here is that she is already in a relationship that has gone to the stage of marriage discussion and he is a single dad. The story revolves around how they overcome the hurdles around them and take the chance, to be honest with their love for each other.
Ji-ho and Jeong-in realize how difficult it would be to have a relationship with each other, so they intend to leave it be. However, tension builds between the two as Ji-ho cannot deny his feelings for Jeong-in and Jeong-in struggles to suppress her feelings for Ji-ho. There are many times where she calls him and wants to meet with him for no apparent reason. After some time, she decides to follow her heart. Both Ji-ho and Jeong-in have to make uncomfortable decisions, and the road for them is never easy as they prove to their parents and friends the sincerity of their feelings.
One Spring Night is not a typical K-drama, it is a thought-provoking series that will make you question and reflect on realities for what they are. If you like slow-burn stories that grow on you slowly but deeply, please watch this show, and you will be all set for an emotional ride.

More detailed review here: https://bookswithnatasa.home.blog/2021/07/10/should-watch-20-one-spring-night/