All penguin frontier's work
Not completed but it updates super slow sadly so I wanna go with this one, I need more chapters for this... https://www.mangago.zone/read-manga/koimonogatari/
And if I gotta choose a completed one then this https://www.mangago.zone/read-manga/the_two_lions/ it ended so abruptly that it was painful but a really good read so I needed more :(
the beast must die :((
Tale of yellow dragon
what's one completed manga that made you wish the author added more chapters to it.