The girl most likely to be Sana had a bf (or still has). No evidence of they're still together or not.
Why she is Sana? Here is the evidence so far:
>Ina's friend for years>is the artist that drew the illustration for the reveal trailer>papa (Pako) is her favorite artist and he's Sana's Mama>she's brown just like Sana (lives in Australia since birth)Twitter:
https://twitter.com/namgoreng 