The love story in Nirvana in Fire isn't necessarily tragic but definitely touching. Plus, the actress in Nirvana in Fire (Liu Tao) looks similar to Bai Lu, like the older version. Both dramas deal with rebellions, revenge, political corruptions, etc.
Both dramas are about family, friends, school, and life in general. A Little Reunion does, however, focus on school and friendship more than Go Ahead does, but they have many common themes!