The EP was re-released as the group's debut Japanese record titled Nolza on September 21, 2011, under YGEX.

2NE1 was met with generally positive reviews from music critics, and was named amongst the best pop releases of the year by Spin.

Five singles were released to promote the record: Park Bom's solo "Don't Cry", "Lonely", "I Am the Best", "Hate You" and "Ugly".

Neither were promoted extensively on music shows; but on May 29, the group made a surprise two-part performance with both songs on SBS's Inkigayo.

[6] On June 24, the third single "I Am the Best" was released at midnight, and subsequently topped all South Korean real-time charts, achieving another perfect all-kill.

Following their Korean promotions, the group announced the release of the album in Japan under the title Nolza.

It was released on September 21, 2011, by YGEX, a newly created label by YG Entertainment Japan in association with Avex.

The publication said that "it might be the year's most boldly thrilling recorded statement", featuring the collision of various genres, from electro-house, hip-hop, and pop-rock guitar.

It re-appeared on the year-end Gaon Album Chart in 2012 at number 77, selling a cumulative 104,000 copies.

[22] The singles from 2NE1 2nd Mini Album showed to be some of the most popular songs in South Korea during 2011; "Lonely", "Don't Cry" and "I Am the Best" were ranked fourth, fifth and seventh on the year-end Gaon Digital Chart, respectively.

[24] All five of the album's singles reached number one on all streaming record charts in South Korea upon release, marking the first time an artist achieved five consecutive "all kills".