Exo band performs during the closing ceremony at closing ceremony of Pyeongchang 2018 Winter Olympics on February 25, 2018
Exo band performs during the closing ceremony at closing ceremony of Pyeongchang 2018 Winter Olympics on February 25, 2018REUTERS/Damir Sagolj

K-pop boy band EXO-CBX member Xiumin chose to have some fun with his fans instead of partying with friends on his birthday March 26. He posted a couple of riddles on the band's fan website for fans to solve. Interestingly, the riddles hinted at the band's comeback next month.

Xiumin has left these riddles on EXO-CBX's fan site (via Scoompi) for fans to solve:

"#1. Difficulty Level 99

CEOMXINOG-SCOBOXN'

#2. Difficulty Level 326

(CH) (XIU-MIN) (EN) (XIU-1) (B) (MIN+1)

•CHEN=>21
•B=>04
•XIUMIN=>99"

The answers to the riddles could be "Coming Soon EXO-CBX" and "2018/04/10." This has sparked off speculations that the band would make a comeback on April 10 this year.

EXO-CBX hasn't announced its comeback yet but several reports have claimed citing sources from S.M. Entertainment, which formed the group, that the band was planning to release a new album in April. And now, Xiumin's riddles have thrown some light on the group's possible comeback.

It may be mentioned that EXO-CBX is also working on a Japanese album titled Magic, which is scheduled to be released on May 9. The band will kick start Magical Circus concert tour of the country on May 11.

EXO-CBX is a sub-unit of South Korean boy band EXO. Also known as CBX or ChenBaekXi, the band comprises three EXO members -- Chen, Baekhyun, and Xiumin – and was formed by S.M. Entertainment in 2016. Its first extended play Hey Mama! was released in October 2016.