Beautiful trumpet piece performed by Jann Lee himself!
This song plays during Jann Lee's DOA4 ending "Reflection" and is the first time his more somber, melancholic side is shown, bringing a new layer of depth to his character, this, in my opinion, makes this one of my favorite themes in the series.
Please note this isn't the official title of the song either, as far as my knowledge goes, this song was never given an official title in any of the DOA4's OSTs.