the midnight romance in hagwon episode 16

After resigning from a big company, Lee Joon Ho returns to the academy where he'd studied, this time as an instructor. He's motivated by his lingering fixation on his first love, academy teacher Seo Hye Jin. Seo Hye Jin has been a Korean language instructor for the past fourteen years. She became a star after the legendary incident labelled “Miracle of Daechi.” Just when her life begins to feel settled, former pupil and troublemaker Lee Joon Ho, whom she'd helped get into a prestigious university ten years previously, shows up and stirs up chaos. (Source: MyDramaList)