Acting career Lee Donghae

2009-2011: Acting career Lee Donghae

In 2009, Donghae along with fellow member Siwon, co-starred in Taiwanese singer Ariel Lin's music video for "螢火蟲" (Firefly), which was released in Blissful Encounter. In July he performed his first composition "Beautiful" during Super Show 2 Tour which was released on Super Show 2 Tour Concert Album. He also played Zhang Li Yin's love interest in her music video, "晴天雨天" (Moving On), released on 19 October 2009.

In 2010, Donghae composed "A Short Journey", with lyrics by fellow member Eunhyuk. Which was released on repackaged Bonamana. In November, he starred in SBS drama, It's Okay, Daddy's Girl as Choi Wook Gi, one of three brothers. He also composed one of it’s theme song "Just Like Now", a duet with fellow member Ryeowook.

Donghae sang the theme song for the 2011 8th Asia Song Festival, "Dreams Come True", with Seohyun of Girls' Generation, which was released on 11 October 2011 as a digital single. The proceeds from the sale were donated to Unicef to help children in African countries.

In 2011, Donghae co-starred again wth fellow member Siwon, in the Taiwanese drama Skip Beat! (Chinese: 華麗的挑戰) with Ivy Chen. It is a live-action adaptation of Japanese shōjo manga Skip Beat! by Yoshiki Nakamura shot in Taiwan for four months. Donghae and Siwon attended a press conference in Taipei on 14 December to launch the drama. He also sang the ending theme song, "That's Love" with fellow Super Junior-M member Henry.