Rookie girl group CLASS:y has wrapped up the first-week sales for their latest album.

According to the data released by the Hanteo chart, CLASS:y's second mini-album 'Day & Night,' which features the title song "Tick Tock Boom," recorded over 4,800 copies sold on the first day of its release and over 4,400 copies on the seventh day, totaling to 19,213 accumulated album sales in the first week, setting a new personal best for the group.

'Day & Night' has become CLASS:y's best-selling album in first-week sales, breaking the record previously set by the group's first mini-album (part one) 'CLASS IS OVER,' which had a little over 18,000 units sold.

Congratulations to CLASS:y!