Won Young and Ki Joon met at a random birthday party for the first time. The two somehow ended up spending the night together, but went separate ways the next morning without turning back. However, they both didn't realize that birthdays happen every year. A year later, they meet again and start spending more nights together. Then suddenly, Won Young proposes to live with Ki Joon.
คลับฟรายเดย์เดอะซีรีส์ 17 Theory of Love ไม่มีทฤษฎีไหนใช้ได้กับทุกความรัก:ความรักคือการให้ / 周五俱乐部17恋情理念 / 星期五俱乐部系列之没有任何理论适用于所有爱情 / 爱情论点之情爱付出 / 爱情理论问题之爱恋论理 / 周五俱乐部17爱情概论之给予爱情 / 周五俱乐部17爱是给予 / Club Friday The Series 17 Love is giving
简介：Won Young and Ki Joon met at a random birthday party for the first time. The two somehow ended up spending the night together, but went separate ways the next morning without turning back. However, they both didn't realize that birthdays happen every year. A year later, they meet again and start spending more nights together. Then suddenly, Won Young proposes to live with Ki Joon.
