Oh, i forgot about declining her offer from 0.2, had it opened before. Thanks for reminding.
And that ending honestly is disappointing. I thought it would be complete game, not a teaser for another game. Definitely not what i expected. Don't want to ruin fun, but it's illogical, misses part of the story and just not complete.
Also, one thing that interested me, if we tell Si Won about app in the beginning, she says she will download it, which leads to the ending, even though she never mentions using it at all. I've tried another route with keeping app in secret, but nothing changes at all, and Alpha appears in the same way.