After waking up in the morning, SUN-FUNG finds things turn out to be exactly the same as those that happened on April 1st. SUN-FUNG recalls the time when LING HOI quarreled with HAU-KUEN the day before, so she deliberately prevents them from meeting each other. On top of that, she even tells LING HOI to go travelling in hopes of helping him evade the disaster. Upon her arrival at the bar, SUN-FUNG spots the wanted criminal named LAT, so she promptly calls for backup. Finding himself besieged by the police with nowhere to escape, LAT instantly takes a minibus passenger hostage, surprisingly, SUN-FUNG discovers the hostage turns out to be LING HOI. SUN-FUNG thinks travelling through time back to April 1st could alter their destiny, yet things take an unexpected turn, to which SUN-KWONG explains as the "butterfly effect".… ...