The title is the thesis. Plankton drifts with the current, unable to control its direction. Hae-jo, Jae-mi, and the supporting characters (including Jae-mi’s gentle but insecure fiancé, Eo Heung) are all "plankton"—drifting through life, feeling powerless against their circumstances. The show asks a profound question: If you can’t control where you drift, can you at least choose who you drift with?

Jae-mi struggles with the idea that she might accidentally be pregnant with Hae-jo's child. The show doesn't demonize abortion or force a "miracle baby" trope. Instead, it treats the pregnancy as a chaotic variable—something that forces characters to grow up without pat answers.

The final scene is set on a beach at dawn. Unlike traditional rom-coms where the hero survives via miracle, Mr. Plankton asks the audience to accept that some people are only meant to be with you for a season. Whether Hae-jo lives or dies is left deliberately ambiguous, focusing instead on Jae-mi’s smile as she watches the sunrise—a symbol that she has learned to drift without sinking.

TV-MA (for language, sexual content, and thematic elements involving terminal illness).

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