My comment:
(a) GDP per capita in the graphic obviously is PPP, not nominal. That explains Taiwan has always surpassed South Korea. (In terms of nominal one, Taiwan is behind S Korea in recent years.)
(b) The last and penultimate dips for Taiwan occurred in 2008 and 2001, respectively. Those tow for S Korea, in 2008 and 1997, respectively.
Note:
(a) summary underneath the title in print: Wang Shu 王澍 recycles old stones in protest of breakneck development
(b) summary in Table of Contents: Pritzker Prize-winning architect Wang Shu wants China's cities to slow down
(c) "his wife, architect LU Wenyu" 陆 文宇