The word/term for a series of bad/negative events turning to a positive outcome

I tried on google every word and phrase I could come up but I just couldn't find it. I'm pretty sure I've seen this word before and it's english.

Solution 1:

I think that a blessing in disguise may fit your description :

​

something that seems bad or unlucky at first, but results in something good happening later:Losing that job was a blessing in disguise really.

(Cambridge Dictionary)

Solution 2:

salutary

From Oxford Living Dictionaries:

salutary ... (especially with reference to something unwelcome or unpleasant) producing good effects; beneficial.

Solution 3:

J.R.R. Tolkien coined the word eucatastrophe, and I think it would match the word you’re looking for.

From Oxford Living Dictionaries:

eucatastrophe A sudden and favourable resolution of events in a story; a happy ending.