Athena Complex

 is a Fantasy Webtoon created by Kaisar; the English version is currently on hiatus.

Summary
''Suffering from heartbreak after being rejected by Poseidon, goddess of wisdom Athena becomes human to seek revenge... but as a high school boy. There she plots to befriend Poseidon’s reincarnation, Adrian, who doesn’t have the slightest clue about the world of gods. But will her sweet vengeance be thwarted by other opposing forces, or will her own one-sided love hinder her plans?''