The Sweetest Taboo

Phakamalin, a self-absorbed online businesswoman, falls for Khatha, a much younger college freshman with high ideals. Both must deal with their differences and wrestle with ensuing trials as Lin discovers that Khatha is the only son of Rangsun, the head of the business empire with whom she secretly had an affair. Meanwhile, Kate—who is Khatha’s mother and Rangsan’s wife—is trying every way to sabotage the unconventional relationship her son has with her husband's lover. Lin and Khatha’s love for each other will be put to test as they must work together to find happiness in their complicated relationship.
(Source: Ch3Plus)