This is a hard one as I believe in the "trousers of time" and so I'd probably give it away. Am I totally happy with my life up until now, hell no. But is there anyone out there who can truly say they are??? Without lying, mind.
Also, it puts me in mind of a jdrama called Reset. I've only seen the first eppy (it has Kiriyama Renn in it. KAWAII) but it shows all too well what can happen if you mess with fate.
(that's for anyone who likes jdramas and is curious)