  The heavy-ion collisions (A--A) at the Large Hadron Collider (LHC) energies
have confirmed the production of the quark-gluon plasma (QGP), a new state of
nuclear matter where quarks and gluons are deconfined. The light-flavour
hadrons ($\pi$, K, p), constitute the bulk of the produced particles, carry
useful information of the collision geometry, collective behaviour and thermal
property of the QGP. The measurements of light-flavour hadron production in
small collision systems (pp and p--A) at the LHC energies have shown the onset
of collective phenomena (e.g. radial flow and long-range correlations) that
resemble what is typically observed in nucleus-nucleus collisions and
attributed to the formation of a deconfined system of quarks and gluons.
  The new results of the identified light-flavour particle production measured
in high-multiplicity triggered pp collisions at $\sqrt{s}=13$~TeV of ALICE Run
2 will be presented in search of collective behaviour in small collision
systems. The transverse momenta $p_{\rm T}$-spectra of the identified particles
show hardening at the mid-$p_{\rm T}$. The mean transverse momenta ($\langle
p_{\rm T} \rangle$) are shown as a function of charged-particle multiplicity.
The ratios of $p_{\rm T}$-spectra and the ratios of the integrated yields of
kaon- and proton-to-pion are also presented and compared with published
results.
