The reason why they laugh is probably not because there are no mosaics in the play.

It can be seen that both Hyun Bin and Rowling's signatures are painted with love, which is also the time for them to exchange bodies. When Rowling signed for Hyun Bin, she wrote an Oscar. Very helpless.

Later, Oscar and Yin Se also signed their names in a special font, so Hyun Bin smiled.