On July 22, 2008, TVXQ became the first non-Japanese Asian artist to have three number one hits on the weekly Oricon singles chart, when their single "Dōshite Kimi o Suki ni Natte Shimattandarō? (どうして君を好きになってしまったんだろう?)" attained the number one position with weekly sales of 68,417 copies.
The B-side track features a reggae-style song, "Box in the Ship", which was used on Universal Studios Japan's "Hollywood Dream the Ride" rollercoaster, since Tohoshinki were appointed "Goodwill Ambassador for Asia" by USJ earlier in the year.
The drama version MV features 20 year-old actress Fujii Mina with an innocent image, casted as the lead of the story in the MV, in which the female gets married before her old lover could confess his feelings.
DVD
| Chart | Peak Position | Sales Total | Chart Run |
|---|---|---|---|
| Oricon Daily Singles Chart | #1 | 53,669 | |
| Oricon Weekly Singles Chart | #1 | 68,417 | 12+ |
| Oricon Monthly Singles Chart | #8 | ||
| Oricon Yearly Singles Chart | |||
| Week | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| Position | #1 | #18 | #23 | #39 | #46 | #70 | #100 | #120 | #159 | #183 |
| Sales | (68,417) | (6,367) | (4,734) | (3,515) | (2,013) | (1,283) | (1,061) | (674) | (470) | (315) |
| Total | 68,417 | 74,784 | 79,518 | 83,033 | 85,046 | 86,329 | 87,390 | 88,064 | 88,534 | 88,849 |
| Day | 1 (7/16) | 2 (7/17) | 3 (7/18) | 4 (7/19) | 5 (7/20) | 6 (7/21) | 7 (7/22) | Debut sales total |
|---|---|---|---|---|---|---|---|---|
| Position | #1 | #2 | #2 | #3 | #11 | #13 | #11 | 68,417 |
| Sales | 53,669 | 8,503 | 3,433 | 2,486 | 1,560 | 1,375 | - |