《笑吧!东海》是讲述被领养到美国,精神年龄只有九岁的安娜,事隔四十年后和儿子东海回到韩国。东海获选代表美国队到韩国参加溜冰短道比赛后立刻打电话向韩国女友尹世华报喜。东海一直梦想到韩国与自己心爱的世华结婚,不过因为世华的母亲希望世华能嫁到豪门,这让世华很为难。

东海在比赛当天早上,为了救世华而发生严重车祸被送往医院,让世华不知如何是好。恢复意识的东海,因伤势而导致他的运动生涯从此结束,虽然世华为此而感到非常自责, 不过世华为了自己的野心, 很冷澹的对东海提出分手,并决定为了自己的将来,接受CAMELLIA饭店的副总管道镇的追求。

世华好不容易摆脱东海的她,却发现东海并没有回美国,反而进入了CAMELLIA饭店工作,让她大为吃惊,于是便想尽办法要把东海赶走。

Carl Laker, whose Korean name is ‘Dong-hae’, visits Korea with his mother to participate in the short track speed skating competition as a representative on the American team. Dong-hae’s mother, Anna, who is a Korean-American adoptee, had an accident during a severe storm and almost drowned at a young age, which led her to have a mental age of about nine. His trip to Korea is not just for the competition, but also to see his girlfriend, Sae-Wa, whom he dated for 6 years and promised to marry. However, what awaits him is the changed heart of Sae-Wa. She tells him that she cannot be with him as long as he is with Anna.

Later, he saves Sae-Wa from being struck by a truck in a traffic accident. The accident injured Dong-hae and ended his skating carer. Meanwhile, Anna sees Dong-hae's father by chance and doesn’t want to leave Korea. Dong-hae decides to stay in Korea and search for his father. He decides to find him and ask him the reason why he left them.

Coincidentally, Dong-hae happened to be working in the same hotel as Sae-wa's husband-to-be, which makes Saw-wa try means and ways to chase him away.