Yakatangwa muna 1990, Liren ibhizimusi rakazvimirira, rine mhuri iro rakapfuudzwa kuburikidza nezvizvarwa zvitatu.Kutenda kuna Mr. Morgen, nyanzvi yekudzivirira kuwa.Akatungamira shamwari yake yekare, John Li (mutungamiri weLiren) muindasitiri yeFall Prevention.
Nemakore anopfuura 20 ane ruzivo mukudzivirira kwekuwa uye kutarisirwa kwechipatara uye maindasitiri ekuchengetedza musha, isu takatsaurirwa kupa vachengeti vekumba kwevakoti vane teknolojia yepamusoro uye zvigadziriso izvo zvichaderedza kuwira kwevarwere uye kubatsira vatarisiri kuita kuti mabasa avo ave nyore uye anobudirira.
Isu hatisi vagadziri chete, asi zvakare tinopa zvigadziriso zvehunyanzvi zvehunyanzvi izvo zvinobatsira vachengeti kupa chengetedzo, runyararo rwepfungwa, uye kutarisira vakwegura, vanorwara, uye kunatsiridza hunhu nechiremera chehupenyu.Zvinoita kuti hukoti huve nyore, hunoshanda uye hune hushamwari.Rega zvipatara nemisha inochengeterwa vakwegura zvideredze mitengo, zvivandudze mhando yekuchengeta, zviwedzere kukwikwidza uye zviwedzere pundutso.