[Nayeon, Sana, Momo]
L, love between ONCE and TWICE is
O, one in a million
V, valuable and
E, everlasting
TWICE can only be completed with ONCE.
ONCE is the key to TWICE's heart.
You can only open our heart,
And once it is opened, it will never close.
The secret between ONCE and TWICE is that there is no secret between us.
We love you, ONCE!