Do Min-Joon, an alien who crash-landed on Earth in 1609 during the Joseon Dynasty, has lived for 400 years, remaining young and with extraordinary abilities like enhanced vision, hearing, and speed. Despite his powers, his cynical view on love shapes his plans to live a quiet, unnoticed life until his time on Earth runs out in three months. Everything changes when he meets Cheon Song-Yi, a top Hallyu star. Her chaotic life and vibrant personality challenge his long-held beliefs about love. As their connection deepens, Min-Joon finds himself facing the very real danger of being exposed, as his feelings for Song-Yi threaten to reveal his true identity. As Min-Joon learns to love through Song-Yi, he must grapple with his impending departure from Earth and the risk of being discovered. Will he choose to remain with her, or will he keep his secret to protect them both?