They first met at some flower exhibition. Ding Dian was told that she was some local official's daughter. Then later Ding Dian went to her house and waited outside, then finally Shuanghua's maid came and asked him when he was leaving......
After that, Shuanghua would put a pot of flowers on her windowsill and look at Ding Dian from behind a curtain daily.
Then Shuanghua's dad Lord Ling wanted Ding Dian to give him the Lian Cheng Jian Fa, but he refused so he was thrown into prison with Di Yun and beaten on every 15th of the month.
(SH slashed her face when her father wanted to force her to marry someone else.)
Di Yun noticed that DD looked lovingly at a tower window (I think) where a different pot of flowers was displayed daily (Shuanghua was locked up here I think). Then one day the pot of flowers were not changed, and they withered away.
So DD knew that SH had died and broke out of prison with Di Yun. They found no one in the tower so they rushed to the Ling residence, where they saw SH's coffin and DD hugged it and cried.
The crafty Lord Ling had spread poison over the coffin, so Ding Dian got poisoned and later died.
Later Di Yun poured DD's ashes into SH's coffin, and to his horror realised that SH was not dead when she was put into the coffin.