On April 7, 2014 the duo followed up their promotions with "Tell Me Why" featuring Infinite Sungyeol’s little brother, Lee Daeyeol as well as actress Mun Ka Young.
Pada 7 April 2014, duo ini melanjutkan promosi mereka dengan "Tell Me Why" menampilkan adik dari Sungyeol dari Infinite, Lee Daeyeol serta aktris Moon Ga-young.