2007. When Donghae and Yoona become a permanent guess on Sukira together with Leeteuk and Eunhyuk. That time, Yoona is more close with Leeteuk and Eunhyuk. That's why Donghae always . So that they would be more comfortable with each other. Days passed, the 2 get close to each other. Yoona and Donghae develop Oppa-Dongsaeng friendship. Even if Sukira ended, Yoona and Donghae become more close to each other. Unlike the first day, they are more comfortable and they often joke each other. December 2007, SMTOWN released a song called "only love". Once again, Donghae and Yoona reunite. They did a duet together.