2011: Popsicle and Japanese debut
In January 2011, they returned to the music scene with a 3-member unit group named Popsicle with members Mika, Karam, and Jay. On January 12, they release their music video "I'll Love You Until It Snows in the Middle of a Summer Day" and made debut performances on Music Bank on January 14 and ended their promotion on January 22 along with the other two members, Hyunmin and Injun. On January 20, The Boss won the Newcomer Award at 20th Seoul Music Awards.
On January 23 they went back to Japan to prepare for their Japanese debut. Their official fan color of pearl terracotta was revealed in February on their official website.
On March 30, The Boss released their first Japanese singles' PV: "Love Power". Their first Japanese single was released on April 13, 2011. They made their debut along with a live event from April 12 to April 17 which took place in Fukuoka, Hyogo, Sapporo, Nagoya and Tokyo. Their debut placed 6th on Oricon Daily Chart and 9th on Oricon Weekly Charts. The single made it to the Oricon Monthly Charts, ranking 30th with 12,136 copies sold. The Boss made new songs for their Japanese debut instead of using translated versions of their Korean releases as other groups did.
On June 15, The Boss released their second Japanese single "Love Bingo!". The "Premium Live & Bingo Event" in Shibuya-AX Tokyo was held on May 21. The members gave their valuable items to five lucky fans. Love Bingo ranked 12th on CD TV's Domestic Charts 2011. The "'Love Bingo!' Live & Love Exchange Event" took place from June 15 to June 19 in Fukuoka, Sapporo, Hyogo, Tokyo and Nagoya.
On September 21, The Boss released their third Japanese single "Love Parade", originally intended as the last of their "Love Series." The single peaked at number 8 on its first week on Oricon Weekly Charts and was also one of their best-performing singles with over 18,000 copies sold on their first week. "Love Parade" also made it to the Oricon Monthly Charts, ranking 26th. The Boss also gathered 30,000 fans for their Love Parade event held in Sapporo, Fukuoka, Nagoya, Osaka, and Kanagawa.
In September, after almost one year in Japan, The Boss returned to South Korea to promote their second single album "Lady". The single contained the ballad title track of the same name, an instrumental version of the song, and "Calling You". On October 30, they released a live version video of "Lady". "Lady" overtook Girls' Generation's The Boys for second in Korean sales in Japan at that time. They wrapped up promotions for "Lady" on November 19 at Live Power Music.
On December 7, The Boss released a new single in their Japanese "Love Series" titled "Love Days". The single reached seventh on Oricon Weekly Charts in its first week with 17,758 copies sold. They also held their live event on December 10 with 10,000 fans. "Love Days" also reached 4th on USEN's K-Pop's Weekly Chart on December 28.
"Love Parade", "Love Days", "Love Bingo!" and "Love Power" were ranked 32nd, 33rd, 38th and 42nd respectively in K-Pop Groups' Japanese Singles Sales Ranking Chart 2011.
