Lyrics: "Sweet smile, beautiful time, never forget, your affection has been engraved in my heart, when we meet the sunrise, we are ecstatic", what song is it?

The title of the song is "The Song of Knowledge (Unforgettable)"

(1) Sweet smile, beautiful time, never forget, your deep feelings have been engraved in my heart, then we were ecstatic about the sunrise, but today we are far apart, leaving endless thoughts and greetings. May youth shine. May friendship last forever.

Your kind voice and lovely face will never be forgotten. Your heroism has been engraved in my heart. At the beginning, the two of us talked about ideals, but today we have no chance to leave too much regret and sadness. May youth shine. May friendship last forever.

(3) Words from the heart, singing from the heart, always remembering, and your figure is permanently buried in your heart. At the beginning, we shook hands openly, but today it is difficult to tell the truth, leaving endless memories and reverie. May youth shine and friendship last forever.