ending 1 is a mix of both ending 2 and 3 options.
ending 2: Are you going to leave?, This place makes you never want to leave, right?, Put the poison, Don’t tell him, and Convince him to go back
ending 3: How is everyone?, your deserve to rest, Don’t put the poison, Tell him, and Let him speak.
If you need more help with the game both Hello Yinny and myself had made full playthroughs of the game if that also helps.