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The recently reported Type II Gamma-ray Burst (GRB) 200826A challenges thecollapsar models by questioning how they can generate a genuinely shortduration of the event. This paper proposes that the burst can originate fromthe collapse of a Thorne-Zytkow-like Object (TZlO). The TZlO consists of acentral neutron star (NS) with a dense white dwarf (WD) material envelope and adisk, which are formed as the aftermath of a WD-NS coalescence. We found thecollapse of such a TZlO can naturally explain the short duration of GRB200826A. Furthermore, the collapse can produce a magnetar as the centralobject, which provides additional energy injection via magnetic dipoleradiation to the ejected WD materials, causing a bump-like feature in theoptical band and a shallow decay of the X-ray band. The disk wind shell inducedby the TZlO at a large radius also interacts with the ejected materials, whichexplains the ``supernova bump" observed at $\sim$ 28 days.

GRB 200826A: Collapse of a Thorne-Zytkow-like Object as the Aftermath of a WD-NS Coalescence