Mr. Plankton (Korean: Mr. 플랑크톤) is a 2024 South Korean romantic comedy television series written by Jo-young, directed by Hong Jong-chan, and starring Woo Do-hwan, Lee Yoo-mi, Oh Jung-se, and Kim Hae-sook.

Mr. Plankton is a romantic comedy about a woman, Jae-mi, as she is forced by Hae-jo, a man who was the product of an incorrect artificial insemination, to accompany him on his last journey in life after learning he is terminally ill. Jae-mi also learns she has a medical problem, which is devastating to her.

[6] On July 12, 2023, Netflix revealed the casting of Woo Do-hwan, Lee Yoo-mi, Oh Jung-se, and Kim Hae-sook.

The production company stated, "We filmed from the morning to the afternoon on October 15 at Hwasun Golden Sand Beach.

After checking, we found that the production team was even more careful and finished cleaning this morning.