The lyrics to By2's song 我知道 convey the emotions of heartbreak and acceptance when a relationship comes to an end. The opening lines speak of the desire to hold hands with the person they love but recognizing that it's no longer possible. The singer then acknowledges the pain they feel when going through tough times without their partner, and how they allowed their own selfishness to lead to misunderstandings in the relationship. Despite all this, the chorus reassures the listener that the love between the two people has never stopped, and that even in parting, they support and care for each other. The wistful longing for the past is expressed in the bridge, with the singer reminiscing on the happy memories they had together and hoping that their love can continue in some way.

The way the lyrics progress from heartache to bittersweet acceptance reflects the complexity of emotions experienced in a breakup. It emphasizes the importance of understanding one's own role in the relationship and taking responsibility for misunderstandings. Despite the pain and sadness, the song encourages listeners to support and uplift each other, rather than treating each other with bitterness and anger.