1. TVXQ - Why Did I Fall In Love With You
This may not be a recent release but it's important to remember the kings of breaking into the Japanese industry. TVXQ broke down barriers for K-pop boy groups trying to make it big in Japan. They set all sorts of records and "Why Did I Fall In Love With You" is one of their best releases.
2. TWICE - TT
Since their debut in 2015 under JYP Entertainment, TWICE has given fans releases beyond their imagination. The girls took Japan by storm ever since their debut there in June 2017. Their first compilation album called '#Twice' charted at number 2 on the Oricon Albums Chart, selling over 136,000 copies in the first seven days. TWICE also became the first Korean girl group to earn a Platinum certification by the Recording Industry Association of Japan for both album and CD single and even ranked third on Top Artist category of Billboard Japan's 2017 Year-End Rankings.
3. BTS - Crystal Snow
The hottest boy band of the century, it's no surprise BTS has garnered a large fanbase in Japan. BTS released their Japanese single "Crystal Snow" that won the love of fans everywhere due to Jin's high notes and each member's shining talent. "Crystal Snow" won love and adoration throughout the Twitter-verse and continue to bring the boys the attention they deserve.
4. EXO - Electric Kiss
EXO's release of "Overdose" was not only the best selling album in South Korea in 2014 but by the end of 2014, they became Japan's best-selling KPOP artist of the year. EXO followed up with a release of their debut Japanese single "Love Me Right" along with an original song called "Drop That." On the day of its release, the single sold a total of 147,000 copies and reached the top of Oricon chart, becoming the best selling debut single in Japan by a Korean artist of all time. Eventually, they grew in popularity with continues Japanese EP releases and even a Japanese website.
5. BoA - Valenti
BoA is the true queen of breaking down the barrier of Korean artists in Japan. She was the FIRST Korean star to break through in Japan and is a trailblazer. She is the only foreign artist to have three albums selling more than one million copies in Japan and is one of only two artists to have six consecutive number one studio albums on Oricon charts since her debut.
6. Girls' Generation - Karma Butterfly
Girls' Generation saw their first Japanese success back in 2010 with their release of "Genie" and "Gee" selling over 207,000 copies and achieving a million certification for sales figures. Their success continued to expand in 2011-2012 where the released "Mr. Taxi/Run Devil Run" that peaked at number two on Oricon Singles chart.
7. Taemin - Solitary Goodbye
Taemin first made his solo debut in Japan in July 2016. He performed with his dance partner Koharu Sugawara, his choreography for his Japanese debut song "Solitary Goodbye," on Mnet's dance program 'Hit the Stage' and took first place in the second episode. Since then Taemin's presence in the Japanese industry continues to grow as he held his first solo concert at Budokan Arena in Tokyo and released a new Japanese song attracting over 28,000 fans. In August 2017. Taemin's first Japanese drama 'Final Life: Even if you Disappear Tomorrow' was announced.
8. VIXX - Lalala ~ Thank you for your love ~
The six-member group under Jellyfish Entertainment is far from unloved. Their success in the Japanese industry encouraged their continuous releases. Their latest release for their first Japanese extended play "Lalala ~ Thank you for your love ~" immediately charted at number one on the Oricon Daily CD Album Charts.
9. Big Bang - Tell Me Goodbye
Big Bang is one of the most successful groups of all time both at home and abroad, and it was efforts like their Japanese single "Tell Me Goodbye" that established them as a legitimate force in the industry.
10. KARA - Go Go Summer
KARA was super popular in Japan. They set all sorts of records for foreign girl groups in Japan. Though it was songs like "Mister" and "Honey" being remade that helped propel the group to the top, once they got there, they released a series of original and worthwhile Japanese language singles. "Go Go Summer" was a bop and performed well on the Japanese charts.