Recording sessions for '' Tree '' coincided with the duo 's seventh Korean album , '' Tense '' , which was released in January 2014 . Similar to the duo 's last two Japanese records , '' Tree '' delves into the usual electronic landscape in its dance tracks , some with hip hop and rock influences . The duo also experimented with genres they previously have not attempted before , such as swing jazz and reggae . A variety of different power ballads permeate throughout the album ; " I Love You " , written by Katsuhiko Yamamoto , emphasizes the duo 's emotive vocal harmony with minimalist programming . Only 22 people were behind the song 's instrumental arrangement , playing the piano , guitar , cello , and strings . However , Yamamoto 's other composition in the album , , uses smooth R&B arrangements . The song was written after the 2011 Tōhoku earthquake and tsunami and its lyrical content refers to hope and faith
2011 Tōhoku earthquake and tsunami
2011 Tōhoku earthquake and tsunami
Tree (TVXQ album)