Korea's premier ballad group 2AM is upping the ante for their latest comeback with 'NOCTURNE'! They've just released a brand-new MV teaser for their title track, 'Regret'.

Staying true to 2AM's soulful music, 'Regret' puts on display the group's amazing vocals and their ability to make any heart weep.

Check out the teaser above, and stay tuned for the full release of their third mini-album!

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