Fans of Red Velvet went 'Psycho' from the SM Entertainment girl group's release last December, but their latest subunit formation did not help stop them from getting even crazier.

Put Irene and Seulgi from Red Velvet together and the outcome is obvious - Red Velvet's latest subunit is an indestructible duo. They have just unleashed the Monster with their first mini album which is now available on all major streaming platforms, and even broke a few records within a day.

Upon the release of the first two teaser videos for the music video of their title track 'Monster', Red Velvet fans have expressed their anticipation over social media while counting down to the release of the official music video.

The keywords 'Red Velvet' and hashtags 'MonsterIShere' and 'RedVelvet_IRENE_SEULGI' have been trending on Twitter in lieu of the comeback, with 'MonsterIShere' emerging as #1 on Twitter's worldwide trends.

#MonsterIShere is trending #1 in 10 locations:

#1 Worldwide
#1 Singapore
#1 Malaysia
#1 Indonesia
#1 Philippines
#1 Vietnam
#1 Thailand
#1 Canada
#1 Brazil
#1 Peru
#1 United Arab Emirates@RVsmtown #RedVelvet_IRENE_SEULGI

— SMTownEngSub (@SMTownEngSub) July 6, 2020

The first mini album is currently seeing soaring digital and physical album sales worldwide, including China's qqmusic, which sees more than 120 million subscribers, and South Korea's Hanteo album charts.

Monster is certified Gold on QQ Music (First tier) with over 15K sales#MonsterIShere #RedVelvet_Irene_Seulgi_Monster @RVsmtown pic.twitter.com/eEkyQV4AMs

— SupportRV | & MONSTER (@SupportRV) July 6, 2020

"Monster" by @RVsmtown Irene & Seulgi is the best selling album by a girlgroup sub-unit on the 1st day on Hanteo. pic.twitter.com/q1OEDnssXX

— Kpop Charts (@kchartsmaster) July 6, 2020

Monster also broke the record of being the best-selling album by a K-pop female sub-unit group, surpassing that of Girls' Generation TaeTiSeo's 'Twinkle' in 2012.

"Monster" (79,301) *still counting* by @RVsmtown Irene & Seulgi is now the best selling album by a girlgroup sub-unit in Hanteo history, surpassing @GirlsGeneration TTS "Twinkle" (74,000). pic.twitter.com/AdsYAj5S1f

— Kpop Charts (@kchartsmaster) July 6, 2020

Here is the music video of 'Monster', a highly anticipated release after two delays by SM Entertainment:

Listen to the full mini album on Spotify: