  In this work, using \textit{NICER} and \textit{Insight}-HXMT observations, we
present a study of the broadband spectral and timing evolution of the source
throughout the first reflare, which occurred about 4 months after the major
outburst. Our findings suggest that during the reflare, below a critical
luminosity $L_{\rm crit}\sim2.5\times10^{36}$ (D/2.2 kpc)$^{2}$ erg s$^{-1}$,
the scale of the corona shrinks in the radial direction, whereas the inner
radius of the disk does not change considerably; however, the inner radius of
the disk starts to move inward when the source exceeds the critical luminosity.
We conclude that at low luminosity the increase in accretion rate only heats up
the inner zone of the accretion disc without the transfer of angular momentum
which occurs above a certain luminosity.
