It doesn't help that Wayne needs to be in a suit while Sheren a long dress. Wayne was seen sweating with drops of diamonds appearing on his forehead. Sheren stays hydrated by keeping a glass of water in hand.
The pair filmed the love scene by the stairs and attract many onlookers. Wayne NG-ed a few times and started laughing. When Sheren saw Wayne laughing, she started laughing as well and the pair end up laughing non-stop. Onlookers took many photographs of them. Due to this, they has to film the scene numerous times.
Source: Oriental Daily with translations by aZnangel @AsianUniverse.net