The Soldier King Son-in-Law

She comes from a wealthy business family, while he is just a sickly country boy. To fulfill a promise to his late grandfather, he has no choice but to marry into her wealthy family...

During the five years he was missing, a mysterious expert took him to a hidden island to train...

While everyone still thinks he's the same invalid he was five years ago, he has actually grown into a legendary soldier...

His personality has changed, too. He is no longer timid and weak, but decisive and ruthless!