The One will be holding his first solo concert.

The One will be holding his first solo concert on December 29 with the title, 'Do you Know that Man'.

The One has been known as the vocal trainer for many top stars such as TVXQ, Super Junior and others.

The One commented, "I want to pour my life and my music on stage. I hope that everyone can share their hurt and pain and heal and have hope at my concert."