The plot of "Mama Boy" tells the story of a 29-year-old boy named "Siu Hung", he has never had a girlfriend until he met her mother, Mei-Ling,  but she is so well protected by his mother that he has never had a girlfriend.It was only when he met the hotel assistant "Lele",  that he first tasted the taste of love.

The reality of the outside world makes the start of this romantic relationship not easy, what will be the end of this sibling relationship?

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《初戀慢半拍》劇情講述柯震東所飾演的29歲男生「小洪」，在水族館工作，個性溫和又長相帥氣，和于子育所飾演的媽媽「美玲」相依為命，但被媽媽保護得無微不至，因此從來沒交過女朋友，直到遇見了徐若瑄所飾演的旅館副理「樂樂」，才初嚐到戀愛的滋味。看似堅強的樂樂也有著煩惱，她不懂如何和范少勳所飾演的兒子「偉傑」相處，小洪成為樂樂的避風港，短暫忘卻生活問題，但外界現實讓這段浪漫姊弟戀關係的展開並不容易，這段姐弟戀的結局會是什麼呢？