On December 11, TWICE unveiled a cheery repackage album 'Merry & Happy' with the title track "Heart Shaker". Soon after the release, the hot girl group hit #1 on all major domestic music charts including Melon, Genie, Bugs, Mnet, Naver, and Soribada; ultimately, recording an all-kill on the real-time charts. 

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Congratulations!