Seohyun sings 16 Going on 17 to Yonghwa when he promises to attend SNSD concert in either Thailand or China. Yonghwa submits his book report to Seohyun to impress her. The CNBLUE members join the couple to throw a small "engagement party" for the would-be married couple. Seohyun teaches them the steps in Oh! and Genie.