第一个原因是西卡退队，第二个也算是主要原因就是少时出道那么多年，经历了很多事黑海啥的，站上东京小巨蛋是她们的梦想也是对她们实力的认可！

　　歌曲：《sunny》　　歌手：少女时代sunny　　专辑：《The 1st Asia Tour Into The New World Album》　　发行时间：2010-12-30　　发行公司：S.M.Entertainment　　歌词如下：　　Sunny, yesterday my life was filled with rain.　　Sunny, you smiled at me and really eased the pain.　　The dark days are gone, and the bright days are here,　　My sunny one shines so sincere.　　Sunny one so true, i love you.　　Sunny, thank you for the sunshine bouquet.　　Sunny, thank you for the love you brought my way.　　You gave to me your all and all.　　Now i feel ten feet tall.　　Sunny one so true, i love you.　　Sunny, thank you for the truth you let me see.　　Sunny, thank you for the facts from a to c.　　My life was torn like a windblown sand,　　And the rock was formed when you held my hand.　　Sunny one so true, i love you.　　Sunny　　Sunny, thank you for the smile upon your face.　　Sunny, thank you for the gleam that shows its grace.　　You're my spark of nature's fire,　　You're my sweet complete desire.　　Sunny one so true, i love you.　　Sunny, yesterday my life was filled with rain.　　Sunny, you smiled at me and really eased the pain.　　The dark days are gone, and the bright days are here,　　My sunny one shines so sincere.　　Sunny one so true, i love you.　　I love you.　　I love you.　　I love you.　　I love you.