You have to work in the garden (and upgrade it). Talk to Ellen to upgrade/create it. To access the garden go to the regular garden, and on the back wall there is a door. You have to find it before the option with Ellen is available.
Then there will be a scene in Lin's room where she and MC get Jin to work in the garden. I can't recall if it automatically triggers, so you may have to go check her room.
From then the events trigger ever few days when MC enters the garden. A couple auto trigger too.
The last event is Jin at the bar.