@Deluluuu i'm a little late but the k-drama is called the same as the title of the manhwa: "Happy Merry Ending". You can watch it on Viki! 
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ּ ֶָ֢. ━O━O━━𓏵━━━━━━ּ ֶָ֢.
⺡ Now playing [Noeul (Love)♡]
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ִֶָ ⋰0:43 ▭▭✭ ▭▭ 3:08
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