简介：Ryu is a skilled young writer who has a girlfriend, Pin, who he's dated since high school. They love each other and plan to marry. But perhaps because of Ryu's fate, he loses her forever in a car accident.
Ryu blames himself. He withdraws and starts leaning on alcohol. With the arrival of Arm, the grandson of the owner of the company where Ryu works, and their gradual relationship, Ryu's world begins to brighten again. When Ryu finds out that he has cancer and may not have long to live, Arm goes all in caring for him and the two decide to live together.
However, the world is always cruel. When Arm and Ryu learn the truth of something that tears them apart, Ryu disappears from Arm's life. Arm tries every means to find Ryu without any luck, until finally, Arm gets a box. This box contains all the answers.
Club Friday Theory of Love: Persistence Rules/周五俱乐部17恋情理念:坚持不懈的爱/周五俱乐部17爱情概论之坚持就是胜利/爱情理论问题之爱要死缠烂打/คลับฟรายเดย์เดอะซีรีส์ Theory of Love ไม่มีทฤษฎีไหนใช้ได้กับทุกความรัก ตอน ตื้อเท่านั้นที่ครองโลก/Club Friday the Series Theory of Love Mai Mi Tritsadi Nai C/
Flower Boy/L0ong Klin Keson/Flower Boy: Enchanted by the Scent of Kaysorn/Long Klin Kaysorn/花香美男/迷醉花香/花香迷魂记/花美男：花香迷魂计/迷恋男香/龙克林凯颂/花美男：迷恋凯颂的香气/花美男：迷恋花粉的香气/魅香男孩/情迷花香中/