Read Manhwa Heart-Aching online in English. Also known as 아리도록, Aridorok, Aching, Lingering Pain, and Heart Aching.

Five years have passed since the boy who never forgot his first love last saw Joo Arin. Everyone else seems ready to look away from her, as if the person she used to be has vanished for good. But to him, the old feelings remain painfully clear, tangled with the question he cannot ignore: what happened to make her change so much?

Set around youth, distance, and the ache of emotions left unresolved, the story carries a quiet romantic tension rather than rushing into easy answers. Their reunion is not simply sweet or nostalgic. It is awkward, tender, and heavy with the kind of hurt that builds when someone precious becomes almost unreachable. As he tries to understand Arin again, the line between first love, concern, and heartbreak grows thinner.

This series may appeal to readers who enjoy school romance, emotional drama, and bittersweet first-love stories.