Younha made her debut as an artist at the young age of sixteen. Younha memulai debutnya sebagai seniman muda pada usia enam belas tahun. Nicknamed the " Oricon comet" for her success in Japan, ^{[ 2 ]} she has released eight singles and two albums there with varying degrees of success. Dijuluki " Oricon komet "untuk sukses di Jepang, ^[2] dia telah merilis delapan single dan dua album di sana dengan berbagai tingkat keberhasilan. Several of her songs have been featured in anime and drama series. Beberapa lagunya telah ditampilkan dalam anime dan drama seri.

Younha was signed to Epic Records, a branch of Sony Music Entertainment Japan , from 2004 to 2008, after which she moved to Sistus Records, a Geneon Entertainment label. Younha ditandatangani untuk Epic Records, sebuah cabang dari Sony Music Entertainment Jepang , dari tahun 2004 sampai 2008, setelah itu ia pindah ke Sistus Records, sebuah Geneon Hiburan label. In South Korea, she is signed to Lion Media and Stam Entertainment. Di Korea Selatan, dia masuk ke Lion Media dan Hiburan Stam.

Lahir di Korea Selatan untuk-mencintai orang tua musik, Younha mulai bermain piano pada usia 4. ^[3] Dia mengembangkan minat dalam Drama Jepang dan mulai mengajar diri Jepang. What began as an interest in Japanese dramas developed into an interest in Japanese music. Apa yang dimulai sebagai suatu kepentingan drama Jepang berkembang menjadi suatu kepentingan musik Jepang. With the recommendation of an older student in her school's broadcasting club, she began listening to artists such as Hikaru Utada and Misia and acquired a taste for Japanese music. Dengan rekomendasi seorang mahasiswa tua di penyiaran's klub sekolahnya, ia mulai mendengarkan artis seperti Utada Hikaru dan Misia dan mendapatkan rasa untuk musik Jepang. Younha began to dream about becoming a singer alongside her favorite artists. Younha mulai bermimpi tentang menjadi seorang penyanyi bersama artis kesayangannya.

2007 - 2009: Sukses Besar di Korea & Kembali ke Jepang

고백하기 좋은 날 (The Perfect Day to Say 'I Love You') Era 고백 하기 좋은 날 (Hari Sempurna Untuk Katakanlah "Aku cinta kamu ') Era

Exactly two months after "Hakanaku Tsuyoku", Younha returned to Korea to release her first Korean album entitled 고백하기 좋은 날 ( Gobaekhagi Jo-eun Nal , translated "The Perfect Day to Say I Love You"). Tepat dua bulan setelah "Hakanaku Tsuyoku", Younha kembali ke Korea untuk merilis album pertama berjudul Korea 고백 하기 좋은 날 (Gobaekhagi-eun Nal Jo, diterjemahkan "Hari Sempurna untuk Katakanlah Aku cinta kamu"). The album was a success, peaking at #1 on the charts. Album ini sukses, memuncak pada # 1 pada grafik. The first song promoted from the album was "비밀번호 486" ( Bimilbeonho 486, "Secret Number 486"), for which she won the SBS Inkigayo Mutizen award twice. Lagu pertama dipromosikan dari album ini "비밀 번호 486" (Bimilbeonho 486, "Secret Number 486"), yang ia memenangkan SBS Inkigayo Mutizen penghargaan dua kali. The second song promoted was "연애조건" ( Yeonaejogeon , "Love Condition"). Lagu kedua dipromosikan adalah "연애 조건" (Yeonaejogeon, "Cinta Kondisi"). She made a music video for the "비밀번호 486", which stars fellow Stam artist Yoon Ji-hoo. Dia membuat video musik untuk "비밀 번호 486", yang dibintangi artis sesama Stam Yoon Ji-hoo. The video featured many image changes for Younha. video ini menampilkan banyak perubahan gambar Younha. The album also features a collaboration with Wheesung . Album ini juga memiliki fitur kolaborasi dengan Wheesung .

On July 14, 2007, Younha appeared on the Korean GomTV MSL Grand Finals (a StarCraft tournament) and performed in the opening ceremony. Pada tanggal 14 Juli 2007, Younha muncul di Korea MSL GomTV Grand Final (a StarCraft turnamen) dan dilakukan dalam upacara pembukaan.

At the 2007 MKMF held on November 17, 2007, Younha won the Best New Solo Artist award. Pada 2007 MKMF diselenggarakan pada tanggal 17 Nopember 2007, Younha memenangkan penghargaan Solo Best New artis