Pine Kiss

In Pine Kiss, the graceful and endearing series by the celebrated Eunhye Lee, Orion is the beautiful and mysterious new teacher at school. He immediately catches the attention of Sebin, daughter of a rich gang leader. When Orion is involved in protecting her from gang rivalry, it becomes apparent that there is more to this teacher than just a pretty face. Not only are students surprised, but Orion's effect entangles the already troubled relationships of the different students. The passionate triangle between Orion and Sebin and another student, Dali, as well as the mysterious past of the beautiful teacher is realized in Lee's elegant drama.
(Source: Net Comics)