What did ji-li discover that she had in common with her new classmate lin-lin in red scarf girl?

Ji-li discovered that she and her new classmate Lin-Lin both had family members who were labeled as landlords by the Communist Party. This shared experience of having a family member with a negative class background brought them closer together and helped them bond over their similar struggles and fears in the midst of the Cultural Revolution. Their common background also made them more empathetic towards each other's situations and fostered a sense of solidarity in facing the challenges imposed by the political climate of the time.