He starts the video by saying, "By the time you watch this, I won't have long hair�and I'll already be in the army, too." He promises to stay healthy in the army, and asks his fans to stay healthy and happy for those two years, as well.

He ends the video with, "In 2 years, I want to meet you again as an even better person. Please wait for me."

The singer entered the Nonsan Training Canter a few days ago, and will serve 21 months as an active-duty soldier.

Check out his video above!