DK and Seungkwan of Seventeen will release EP “Serenade” as a subunit on Jan. 12, agency Pledis Entertainment announced Wednesday. The news was shared through a teaser trailer titled “An Ordinary Love.” In it, DK tries to make a call multiple times and cannot bring himself to hang up, even when no one answers. Seungkwan, on the other hand, is reminded of his past love when he spots a manga series someone brought to his work. As suggested by the album title, the pair will portray moments of love