The Plan Man is a South Korean romantic-comedy movie directed by Lee Seung-joo. The movie centers around a man named Jung-seok, who has a habit of planning every aspect of his life, from his daily routine to the bigger milestones. He lives alone and mostly keeps to himself, avoiding human interactions as much as possible.
One day, Jung-seok meets a woman named So-jung, who moves in next door. So-jung is everything that Jung-seok is not - carefree, impulsive, and spontaneous. She disrupts his meticulously planned life, much to his annoyance, but soon, he finds himself drawn to her.
Despite their differences, Jung-seok and So-jung begin to spend more time together and slowly develop feelings for each other. However, Jung-seok's fear of the unknown and his reluctance to deviate from his plans create obstacles in their relationship.
As their relationship progresses, Jung-seok learns to let go of his rigid ways and embrace the unknown. The Plan Man explores the themes of love, friendship, and the importance of living in the moment.