1, the lyrics of "I can't guess" express that lovers would rather let go than suffer together because they can't guess each other's thoughts, emotions and different pursuits, and they are free and easy after the entanglement of love.
2. Doubt is a song written by Wang Yajun and Zhang Yaowei, composed by Chen Yiyi and sung by Angela Zhang, and included in the album Aurora released by Angela Zhang in 2004.