Cat and Mouse is the sixth studio album by Singaporean duo, By2.

The album was released on July 28, 2015, with a total of 9 tracks and 5 singles.

Before the album was released By2's record label, Ocean Butterflies International, uploaded the music video of the album's first single "Back in the Days" (當時的我們) on their YouTube Channel on July 12, 2015.

Music videos for three other promotional singles were also released later through the label's official channel.

By2's single (當時的我們) "Back in the Days" reached the top 3 on Taiwan's KKBox music chart on August 12, 2015.