B1A4's Sandeul�and 'tough guy' actor Choi Min Soo�paired up to sing on the November 16th episode of 'Immortal Song 2'.

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Choi Min Soo commented, "I've never watched 'Immortal Song', but I think that music is communication," on why he joined the show. Sandeul also said, "It was comfortable as sunbae took the lead, and it was a good experience because I got to learn a lot."

The two covered Shin Joong Hyun's "Woman in the Rain", intermingling Choi Min Soo's trademark rough voice and Sandeul's smooth ad-libs.�

They managed to defeat Kim Young Ho�and Jo Jang Hyuk's 4-round streak, but Lim Chang Jung�and Kim Chang Ryul�won this episode.