He felt guilty. He agreed to the long weekend in Singapore when he found out Jihyo was not going to be around on her birthday a few months ago. It wasn’t her fault because the date was set much earlier by her management. But he was upset that she didn’t speak up and ask for a change of schedule since it’s her special day. So he took on the project since she is not going to be around. Then, another event came attached with the project he can’t refuse. He ended up committing himself for a long weekend away on her birthday.