Actor Lee Seung Joon to Marry on December.

42-year-old actor Lee Seung Joon will marry his long time girlfriend, a dentist who is four years younger than him.

It was recently revealed by sources that the two have been dating for four and a half years. They met on an actor/fan encounter, and clicked right away.

They are both really close to each other and have been taking care of one another since then.

The actor already met her parents and he is preparations for the wedding that will take place on December 5, in an undisclosed location.

She is an intelligent, sweet woman, who has a good reputation and loyal to the actor.

The host of the wedding will be Kim Sung Min.

The actor recently acted in the drama "Dr. Jin" as  Kwon Ik Joo