Leessang's Gil and Yoon Do Hyun promise not to drink until December?

Leessang's�Gil and�Yoon Do Hyun recently revealed their determination to give up drinking until the conclusion of their upcoming joint concert event.

Yoon Do Hyun first tweeted, "Finally revealing!! [YB and Leessang] have combined together!! 12/23 (7PM), 12/24 (8PM) at Kyunghee University Hall of Peace". Gil retweeted the message and added, "We're not going to drink as promised until after the concert dates keke".

To motivate themselves to stick to their resolution, Yoon Do Hyun decided to wager money as he replied, "1,000,000 KRW! (approximately 900 USD)", implying that whoever breaks it first will have to cough up the money to the other.

Gil replied, "Hyungnim~ I'll go for it� If I can't keep the promise of not drinking� Please use it for good things�^^", asking Yoon Do Hyun to use the money for charity.

The exchange between the two had fans laughing and making guesses about who would be the first one to lose the bet.

Image: Review Star Hankooki