bittersweet
Although sad, the story is not a tragedy at all, but bittersweetly romantic.
I think this is one of the most bittersweetly life-affirming choruses of any song.
The film is so bittersweetly moving as it explores deception and self-deception.
It is interesting to compare his art with his real life, which, bittersweetly, seems to have less meaning to him.

SMART Vocabulary: related words and phrases

Feeling pleasure and happiness
(as) pleased as Punchidiom
ASMR
be dancing in the streetsidiom
be floating on airidiom
be full of the joys of springidiom
chipper
chirpily
chirpy
chuffed
contented
happily
happy camper
happy placeidiom
jaunty
jocund
sunnily
swooning
swooningly
swoony
take delight in something/doing something

You can also find related words, phrases, and synonyms in the topics:

Feeling sad and unhappy