Lee Donghae in Sub-group

2007-2008: Lee Donghae in Sub-group

Donghae's official debut as an actor was in July 2007, with the release of Super Junior's debut film, Attack on the Pin-Up Boys. Donghae stars as a class mate and close friend of Kim Kibum, a high school student who investigates on a mysterious attack on pretty boys in various high schools in town. In late 2007, Donghae was featured in Girls' Generation's "Kissing You" music video. Also, he and Kyuhyun appeared and sang for facial wash product commercial "Happy Bubble" with actress Han Ji Min.

In April 2008, Donghae was put into seven-member sub-group Super Junior-M, a Mandopop subgroup of Super Junior for the Chinese music industry. They debuted in China at the 8th Annual Music Chart Awards, simultaneously with the release of their first music video, "U" on 8 April 2008. This was followed by the release of the debut Chinese-language studio album, Me in selected provinces in China on 23 April and 2 May in Tawain.