Optical colour-plane of selected of 2605 z_phot > 5.6 quasar candidates from our colour-cuts and SED fitting. The candidates (circles) are colour-coded according to their photometric redshift. We show redshift-colour tracks for Le PHARE templates: a typical quasar (pl_QSO_DR2_029_t0, an SDSS-DR5 composite modified by Salvato et al. 2009) and a Seyfert II template (Sey2_template_norm, Polletta et al. 2007), with increasing extinction values (0.0, 0.1, 0.2) displayed by increasing transparency. Squares indicate selected z_phot > 5.6 candidates that are already confirmed in literature (references in Fan et al. 2023). The five quasars discovered in this work are shown as magenta stars.