SHINee's Key showed thanks to Girls' Generation's Taeyeon for helping him with his career.

On the October 5th episode of 'Kim Shin Young's Noon Song of Hope', DJ Kim Shin Young mentioned Key and Taeyeon's close brother-sister bond, saying, "We filmed my music video together, and she even featured in the song with me. Whenever I offer something, she always agreed to work with me. When I ask for a favor and she says she'll do it, I get surprised. I asked her to feature in the song, and I wasn't even expecting her to star in the MV. She said she would."

Kim Shin Young then said, "Taeyeon changed to an active person, and I'm so happy. She's so kind, but I feel like she enjoys her alone time too much." Key revealed, "This time, I'm going to join a new show with Taeyeon. Taeyeon asked me to join her first, and I almost cried."

In related news, Taeyeon featured in Key's pre-release track "Hate That...", and he recently made a comeback with "Bad Love".