比翼双飞恋一倍子
[bĭ yì shuāng fēi liàn yī bèi zi]
Based on Chinese traditional saying “two lovers stay together wing-to-wing”，this term refers to two people loving each other deeply and closely. A variant of 恋一生 (love for one lifetime) was mistakenly written as 恋一倍子, which has become a humorous or unique expression.