There is a time limit:
Entering Qianqing Palace during the day on January 1, 2011
Entered the men's hot spring on February 1, 2011
On February 15, 2011, Changle Palace can trigger Princess Weiyang’s story during the day.
On May 27, 2011, you can meet a plot male concubine in the Royal Garden at dusk.
The hidden plot of White Phoenix can be triggered in the Royal Garden at dusk on June 7, 2011
On August 6, 2011, a female concubine can be triggered in the imperial dining room during the day.
On September 16, 2011, the Royal Garden can trigger the Empress line to choose one queen (male)
At dusk on November 18, 2011, the Qianqing Palace can trigger a plot of a male concubine.
There are lights on the night of March 21, 2012, which can trigger a conversation between Ji Lanxi and Ji Xinghuan in the Qianqing Palace.
At dusk on April 11, 2012, Chu Xiu Palace has a probability of triggering and you can capture a female concubine.
Entering the imperial dining room on the night of July 23, 2012 can trigger two key characters (the male concubine can be captured)
On September 9, 2012, with three thousand spiritual powers, the spiritual pet plot can be triggered during the day.
Unlimited:
You can randomly encounter Ji Lanxi in the Royal Garden
Randomly entering a men's hot spring has a chance of triggering Ji Xingyu's plot.
Before May 11, 2012, the spiritual power of 5,000 and Jun Chen did not die in the Royal Garden can trigger the twin death case of Jun Chen's encounter.