The grandma tells Sol that she remembers her on a wheelchair is because , the accident that happened in 2008, the culprit escaped, and he tried to hurt sol again in 2009 ( which explains the 14/15 years dispute between Sol and the Mom), so in the second accident , Sol gets hurt, not paralyzed as before, but enough for her to use a wheelchair for a while.

My theory to be confirm with this next jump back to im sols college days.

The taxi driver is sonjae’s stalker and all the attacks on imsol is due to sunjaes interaction with her.  And stalker thinking imsol is getting in between him and sunjae.

Original timeline sunjae has crush and starts following after her like a lost puppy, imsol attacked but saved the 2 part ways for 14 years. They meet again and sunjaes makes specifically stoops at the bridge to meet her and receives a gift, sunjae dies that night.

Alt timeline, sunjae still has a crush but imsol now is aware of his presence and they grow closer as friends. She is attacked by taxi driver and saved, again Sujae and imsol go separate ways for 14 years and reunite, sunjae is killed within a day of their reunion.

If parting ways and not meeting sunjae for 14years kept both sides safe until they reunited, with this next time jump to college days and them spending time together again one of them should be attacked again to drive them apart again.

In the last episode, it was said that the villian was put in jail in 2009 for murder. But imsol and sunjae are both alive. so who did he kill!?! WAS IT TAESUNG? 

A thought popped in my head just because they shown a dead body / crime being discovered or investigated at the reservoir. Maybe Sol witnessed that murder or something that's why the taxi driver is seemingly chasing her.  Taxi driver could be a serial killer. And she might have forgotten these things due to 34-yo Sol entering her body or just because PTSD of witnessing something gruesome. We are not sure of everything that happened in the 10 days when 34-yo Sol gets back to the future after her first time slip.

It might have been the killer's motivation to abducting Sol.

 jxxvvxxk:

GUYS THE TAXI DRIVER MIGHT BE A TIME TRAVELLER?! Bc how could he have know he was going to be arrested in 2009 UNLESS he travelled back in time!!! OMG

I believe he's already stalking Im Sol and most likely saw her enter the station.